Relier Pairs Talking About FunctionsVersion en ligne Matching par Logos Sprachinstitut 1 The function of the switch is to turn the machine on and off. 2 The purpose of the backup file is to keep our data safe. 3 The airflow is regulated by the valve. 4 The shelf is bolted to the wall with screws. 5 The bridge is supported by steel pylons. 6 The vehicle is powered by the engine. 7 The purpose of the wheel is to steer the truck. The backup file keeps our data safe. The switch turns the machine on and off. Steel pylons support the bridge. The wheel steers the truck. Screws bolt the shelf to the wall. The valve regulates the airflow. The engine powers the vehicle.
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